This isn't some internet crank like Moldbug. He's as mainstream as libertarians get.

Apparently everybody left from center considers him a huge racist for some of the racial aspects of IQ in The Bell Curve. This really does not do justice to that book, but I am just saying about 50% of your population and 90% of your elites had put him into the fringe extreme crank category. From my outside-US but reading a lot of websites angle, a truly mainstream, non-controversial and generally liked-all-over-the-spectrum libertarian would be Megan McArdle or Glen Instapundit Reynolds. Sowell maybe. Or the Marginal Revolution guys.